Job Telligent.Evolution.Platform.Theming.Implementations.LegacyTheme is stuck

Telligent.Evolution.Platform.Theming.Implementations.LegacyTheme is stuck

A few months ago we upgraded to Telligent Community 10.3.0.5640.
Since then a job has been stuck in the jobserver causes multiple problems(High CPU, other jobs are stuck)

Aside from what I can guess, what does the job do. Does telligent trigger it and can I prevent it.
Should there still be 'dbo.tmp_Themes' tables in the database or should these be gone?

Any advise regarding this topic is appreciated.